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    <article id="post-Docker搭建开源邮件服务器 EwoMail" class="article article-type-post" itemscope itemprop="blogPost">
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        <p>为什么要用 Docker 装 EwoMail，因为开始试过了，不行。直接装的话，需要 Centos系统，于是服务器直接选了Centos7.6系统。</p>
<p>然后装个git，直接就可以下载EwoMail。然后安装的时候发现装 EwoMail 需要干净的系统，没有安装 mysql、nginx。<br>然后发现压根不行，这些不管直接的官方系统，还是别的，反正都带了mysql的。</p>
<p>于是，索性直接选个带 Docker的Centos系统，用Docker来装EwoMail，因为发现有这个镜像的。</p>
        
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        <p>Python 文字识别，有个OCR 库——Tesseract，看网上评论说识别出来不精准，准确率不行。还是用百度的文字识别API精准得多。使用也很简单。</p>
        
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    <article id="post-Python-备份-豆瓣-读过的书的记录" class="article article-type-post" itemscope itemprop="blogPost">
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        <p>之前总是担心某一天豆瓣撑不下去了会倒闭。于是，总想着把自己在豆瓣标记的读过的书，看过的电影都备份存下来，主要还有一些看完当时的短评记录。</p>
<p>电影的页面和读书的页面差不多的，所以这里就介绍一下备份读过的书的方法。<br>最终存到Excel表格中和数据库中。</p>
        
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        <p>Python 用selenium 在网页上操作的时候，我们经常遇到，点击一个链接 或者 按钮，就会打开一个新窗口 。</p>
<p>然后会出现一个问题，新的窗口虽然打开了，但是 WebDriver对象对应的还是老窗口，自动化操作也还是在老窗口进行。那就无法在新窗口上进行自动化操作了。</p>
        
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        <p>这个错误是在我频繁load excel文件，写入内容的时候出现的，循环要写入上千页的内容，每页写一次，然后写了上百次之后，就每写入几次就报这个错了。</p>
<p>windows10 的环境有这个问题，在 linux(ubuntu) 上运行同样的代码并没有这个问题。</p>
        
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        <h2 id="错误提示"><a href="#错误提示" class="headerlink" title="错误提示"></a>错误提示</h2><p>python中字符串的最后一个字符是斜杠会导致出错：<br>SyntaxError: EOL while scanning string literal</p>
        
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        <p>Ubuntu系统里有个定时任务的管理器 crontab，所以只需要编辑下定时任务，再重启下定时任务就行了。</p>
<p>因为是一台Ubuntu的服务器，一直开机的状态，所以开着定时任务就等于一直开着了。</p>
        
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        <p>用 Linux系统的时候，经常会碰到文件权限的问题，比如没执行权限，没写入权限等。</p>
        
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        <p>vim平常如果很少使用，偶尔用用的，我觉得掌握这点就够用了。</p>
<p>vim有两种模式，一种是命令模式，另一种是编辑模式。</p>
<p>在命令模式下，只能输入命令操作，并不能输入内容；<br>在编辑模式下，则能正常编辑内容。</p>
        
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        <p>使用自带的 top命令和 htop命令就可以查看，个人推荐第2种。</p>
<h2 id="方法一：用自带的-top命令查看"><a href="#方法一：用自带的-top命令查看" class="headerlink" title="方法一：用自带的 top命令查看"></a>方法一：用自带的 top命令查看</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">top</span><br></pre></td></tr></table></figure>
        
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